From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C459C33CE9B; Tue, 27 Jan 2026 10:44:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769510663; cv=none; b=KajwtUm4JBhTClru6y246Z/mLC79Af61YZhW4RxpxH/zETXziFqvlJ4yAo1iEgD9XP6KgeftHa+RG0zUKArz3mn+ML9HMrd8JJ9Khf40+tZia/v8CsCXPmZ4XoSDp2GstNtCI6o3FS1JlFMP0cai46l2tf3Um77c9KJDpr1yem0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769510663; c=relaxed/simple; bh=fe6jsoP6wiwv9sD2TLG8dlXjbtoFP2vey4oFqzHNg+c=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=NoKiwDea2D9rUEwAU8d1G9oLfo2aPQyIAlELyQqtDkkMEWEg2LDwdkOSCsMhtmh+N4CTsMEgSVNTSJBc3xOp/piuY3bNaSS89b/isEswuj6aEu83KvGSXXy7rEgU0hwzesbSrA2LKOhRDTgpSzbqMYIuMetOhI2il5w7qHfSexI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mqJ0cCW3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mqJ0cCW3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 741BEC116C6; Tue, 27 Jan 2026 10:44:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769510663; bh=fe6jsoP6wiwv9sD2TLG8dlXjbtoFP2vey4oFqzHNg+c=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=mqJ0cCW38jdZM+ndfpp01/k4OxkE03o7a5iaTSCnipPIjbevKLI033Ga4KlUrjse6 bIA5OVsYYgusLaIVu1t47AWk11DCaG7sy2j4D2bq+vyLm1l75HAY2OKa4qp6f4/8ff GbMx09moY4XDnlDZB60eXfz2/3uP0J2pt0YTmTJU16RTK+qBsyZMQh83Rw2Yjrk8xF tZxjLIV1zP7H+nCxdBOGmhuf8xy3/aY/Nhh7p0FL1ZFsMqmykRPKa+l+owutKDeT1z QuZuNhB+H83vpfI7ZhL8MCgFyvOuJMgs/oBoKyODEhqPJMVtyXF3um/sJnbBJTupZx t/fYrTrztywgA== Message-ID: Date: Tue, 27 Jan 2026 11:44:19 +0100 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/3] media: i2c: ov02c10: Use runtime PM autosuspend to avoid brownouts To: Bryan O'Donoghue , Saikiran , linux-media@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, rfoss@kernel.org, todor.too@gmail.com, bod@kernel.org, vladimir.zapolskiy@linaro.org, sakari.ailus@linux.intel.com, mchehab@kernel.org, stable@vger.kernel.org References: <20260126173444.10228-1-bjsaikiran@gmail.com> <20260126173444.10228-4-bjsaikiran@gmail.com> <900cc5dd-c39d-42f6-9531-016f62da81e8@linaro.org> From: Hans de Goede Content-Language: en-US, nl In-Reply-To: <900cc5dd-c39d-42f6-9531-016f62da81e8@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 27-Jan-26 10:46, Bryan O'Donoghue wrote: > On 26/01/2026 17:34, Saikiran wrote: >> On Qualcomm X1E80100 platforms, the OV02C10 sensor experiences brownouts >> if power-cycled too quickly (< 2.3s) due to slow passive discharge of >> regulator rails. >> >> Implement Runtime PM Autosuspend with a delay of 1000ms. This keeps the >> regulators enabled for a short duration after the device is closed, >> preventing costly power-off/power-on cycles during rapid user >> interactions (e.g., browser permission checks). > > But if you try to power the sensor 1.1 seconds later what happens ? > > With this commit log this submission is a NAK, for example why do I want this change on an x86 machine ? > > We need to root-cause the failure not paper over it. p.s. I also agree that the actual problem with stop + start stream in calls quickly after each other still needs to be properly figured out and fixed. Regards, Hans